I have 9.1 on my Air 2 and it isn't as smooth as 8.4. My parents don't need all the bells and whistles.

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Huh. Did you set it up as new or upgrade over your existing setup? I set my Air2 as new when I installed iOS 9, and it's been just as smooth as it was on the 8. I understand what you mean by your parents not needing the bells and whistles, but I see no need to go out of your way to avoid 9.

The included features on iOS 9 vs 8.4 make it worth the upgrade even if its not as "smooth". Split screen and slide-over are extremely useful. With that being said, I am running 9.2 B4 and its just as "smooth" as 8.4 and I have zero issues.

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